Hi Ben,
Did you try modifying the CSS? it’s all there. Let me indicate which rule is the one you need to change:
.cleanlogin-notification {
clear: both;
border: 1px solid;
border-radius: 5px;
font-size: 14px;
text-align: center;
padding: 18px;
margin-bottom: 18px;
-webkit-box-shadow: 2px 2px 3px rgba(0,0,0,.25);
box-shadow: 2px 2px 3px rgba(0,0,0,.25);
-moz-animation: cssAnimation 0s ease-in 5s forwards;
/* Firefox */
-webkit-animation: cssAnimation 0s ease-in 5s forwards;
/* Safari and Chrome */
-o-animation: cssAnimation 0s ease-in 5s forwards;
/* Opera */
animation: cssAnimation 0s ease-in 5s forwards;
-webkit-animation-fill-mode: forwards;
animation-fill-mode: forwards;
}
In the same way, I’d recommend you to change it in your theme/functions/internal plugin, in order to avoid any overwrite within any plugin update.